Demi Moore was said to be hurt and humiliated last night as it emerged that pop star Rihanna enjoyed a four-hour liaison with her ­estranged husband Ashton Kutcher this week.

Movie star Demi, 49, has told pals she’s devastated at Ashton’s latest supposed fling... and wants him out of her life.

A source close to Demi said: “Ashton’s been spotted with numerous women in the past few weeks and it’s really hit Demi hard.

“She feels like he’s rubbing her face in it with all these women and having a female like Rihanna visit his bachelor pad late at night is the final straw for her.

“Now she doesn’t want anything to do with him any more. She’s gutted he’s treated her like this after all they’ve been through.”

Following dinner in Santa Monica at her favourite restaurant Giorgio Baldi on Thursday night, Rihanna’s car was seen dropping the star at party animal Ashton’s mansion Los Angeles shortly ­before midnight.

She’s believed to have been picked up and taken home at 4am.

The eyes have it: Ashton with estranged wife Demi and Cameron Diaz before the split (Image: Getty)

Reports emerged that they have been secretly “dating” for the past eight weeks despite both celebrities being linked to other partners. Ashton, 34, has spent the past few months – since his split with Demi over cheating allegations alongside long time friend Lorene Scafaria. But sources say the pair have yet to make their relationship exclusive.

Rihanna and Two And A Half Men star Ashton have yet to comment on the reports but this is the second sighting of them together in one week.

Sources say Barbados-born Rihanna is playing hard to get and knocking back his advances, maintaining she wants to keep their relationship platonic.

But the friendship could be enough to push heartbroken Demi over the edge. She only checked out of rehab at the start of March following her split with Ashton.

“Demi’s been very fragile,” adds the source. “But she’s got a good support group around her. She just wishes Ashton would start being more low-key and taking note of the fact while he is able to party around LA, she’s a woman with a broken heart who is going through a hard time.

“She expects a bit more respect from them both, especially in the public eye.”

Ashton and Demi married in September 2005. She filed for divorce last November after claims that he had shared a night of passion with party girl Sara Leal, 22 on his sixth ­wedding ­anniversary.